A handful of self-driving Ubers will ferry passengers around Pittsburgh starting this month.

The semi-autonomous cars will pick up customers and — since the technology is still in testing — the brave guinea pigs will get the ride for free.

The fleet consists of a modified version of a Volvo XC90. A driver will be in the front seat with their hands on the wheel so they can take over if anything goes wrong, and an engineer will be in the passenger seat to take notes on the drive.